docs: add returns annotations

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---

Author: Planeshifter

lib/node_modules/@stdlib/math/array/special/abs/docs/types/index.d.ts

@@ -73,6 +73,7 @@ interface Unary {
 	* // returns [ 1.0, 2.0, 3.0 ]
 	*
 	* var bool = ( out === y );
+	* // returns true
 	*/
 	assign<V extends OutputArray<number>>( x: InputArray<number>, out: V ): V;
 }
@@ -95,6 +96,7 @@ interface Unary {
 * // returns [ 1.0, 2.0, 3.0 ]
 *
 * var bool = ( out === y );
+* // returns true
 */
 declare const abs: Unary;
 

lib/node_modules/@stdlib/math/array/special/abs/lib/main.js

@@ -65,6 +65,7 @@ var POLICY = 'same';
 * // returns [ 1.0, 2.0, 3.0 ]
 *
 * var bool = ( out === y );
+* // returns true
 */
 var abs = unaryFactory( base, IDTYPES, ODTYPES, POLICY );